The man charged with killing a Cole Camp family was identified by voice as the person threatening the family on the night they died.

Documents obtained by KSPR News under Missouri's Sunshine Law show someone called 911 at 10:16 p.m. on June 7, 2009. That's the night police believe Donnie, Sharon and Taron Luetjen died.

From the heavily redacted records:

"The telephone recording system at the Central Dispatch trapped the incoming telephone number prior to the call being terminated ... during the course of the investigation and examination ... it was determined that one of the male voices was directing Sharon Luetjen to sit down, put her arms behind her and at least two threats to shoot her and the other two victims."

Ten days later, police interviewed an unidentified person, who listened to the audio recording of the 911 call.

"Each time (the person) listened to the recording, (the person's) lower lip began quivering and (the person's) breathing rate increased," according to the police records. "(The person) was then instructed to listen to the recording at a lower speed. When (the person) listened to the recording ... (the person) removed the earphones and said ... it was Robbie."

That would be Robert Blurton, a nephew of Donnie and Sharon Luetjen. He told police he used to live in the Cole Camp home, but moved before going to prison in 2003.

Investigators say Blurton would have knowledge of the Luetjen's possessions and monies, as well as weapons in the residence or shop. The report says nothing inside the home was ransacked and minimal objects were out of place.

"Blurton told investigators he had not physically seen Donnie or Sharon since the night before he went to prison in 2003," according to the records.

Police say Blurton gave several different stories as to his whereabouts during the time of the homicides. One of his alibis is that he spent the night following the murders at a motel in Garnett, Kan.

Police also interviewed Robert Blurton's brother. He told investigators his brother may have owed money to inmates he associated with while in prison. The brother, Marvin Blurton said he was contacted by one of those inmates in June in an attempt to locate "Robbie."

Blurton's being held on $3 million bond. Police say they're looking for at least one other suspect in the slayings.